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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Bladder Cancer Recurrences</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for bladder {survival}"><tr><td>bladder {survival}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Bladder Cancer Recurrences</h2> <h3>Description</h3> <p>Data on recurrences of bladder cancer, used by many people to demonstrate methodology for recurrent event modelling. </p> <p>Bladder1 is the full data set from the study. It contains all three treatment arms and all recurrences for 118 subjects; the maximum observed number of recurrences is 9. </p> <p>Bladder is the data set that appears most commonly in the literature. It uses only the 85 subjects with nonzero follow-up who were assigned to either thiotepa or placebo, and only the first four recurrences for any patient. The status variable is 1 for recurrence and 0 for everything else (including death for any reason). The data set is laid out in the competing risks format of the paper by Wei, Lin, and Weissfeld. </p> <p>Bladder2 uses the same subset of subjects as bladder, but formatted in the (start, stop] or Anderson-Gill style. Note that in transforming from the WLW to the AG style data set there is a quite common programming mistake that leads to extra follow-up time for 12 subjects: all those with follow-up beyond their 4th recurrence. This "follow-up" is a side effect of throwing away all events after the fourth while retaining the last follow-up time variable from the original data. The bladder2 data set found here does not make this mistake, but some analyses in the literature have done so; it results in the addition of a small amount of immortal time bias and shrinks the fitted coefficients towards zero. </p> <h3>Usage</h3> <pre> bladder1 bladder bladder2 </pre> <h3>Format</h3> <p>bladder1 </p> <table summary="Rd table"> <tr> <td style="text-align: left;"> id:</td><td style="text-align: left;"> Patient id</td> </tr> <tr> <td style="text-align: left;"> treatment:</td><td style="text-align: left;"> Placebo, pyridoxine (vitamin B6), or thiotepa</td> </tr> <tr> <td style="text-align: left;"> number:</td><td style="text-align: left;"> Initial number of tumours (8=8 or more)</td> </tr> <tr> <td style="text-align: left;"> size:</td><td style="text-align: left;"> Size (cm) of largest initial tumour</td> </tr> <tr> <td style="text-align: left;"> recur:</td><td style="text-align: left;"> Number of recurrences </td> </tr> <tr> <td style="text-align: left;"> start,stop:</td><td style="text-align: left;"> The start and end time of each time interval</td> </tr> <tr> <td style="text-align: left;"> status:</td><td style="text-align: left;"> End of interval code, 0=censored, 1=recurrence, </td> </tr> <tr> <td style="text-align: left;"> </td><td style="text-align: left;"> 2=death from bladder disease, 3=death other/unknown cause</td> </tr> <tr> <td style="text-align: left;"> rtumor:</td><td style="text-align: left;"> Number of tumors found at the time of a recurrence</td> </tr> <tr> <td style="text-align: left;"> rsize:</td><td style="text-align: left;"> Size of largest tumor at a recurrence</td> </tr> <tr> <td style="text-align: left;"> enum:</td><td style="text-align: left;"> Event number (observation number within patient)</td> </tr> <tr> <td style="text-align: left;"> </td> </tr> </table> <p>bladder </p> <table summary="Rd table"> <tr> <td style="text-align: left;"> id:</td><td style="text-align: left;"> Patient id</td> </tr> <tr> <td style="text-align: left;"> rx:</td><td style="text-align: left;"> Treatment 1=placebo 2=thiotepa</td> </tr> <tr> <td style="text-align: left;"> number:</td><td style="text-align: left;"> Initial number of tumours (8=8 or more)</td> </tr> <tr> <td style="text-align: left;"> size:</td><td style="text-align: left;"> size (cm) of largest initial tumour</td> </tr> <tr> <td style="text-align: left;"> stop:</td><td style="text-align: left;"> recurrence or censoring time</td> </tr> <tr> <td style="text-align: left;"> enum:</td><td style="text-align: left;"> which recurrence (up to 4)</td> </tr> <tr> <td style="text-align: left;"> </td> </tr> </table> <p>bladder2 </p> <table summary="Rd table"> <tr> <td style="text-align: left;"> id:</td><td style="text-align: left;"> Patient id</td> </tr> <tr> <td style="text-align: left;"> rx:</td><td style="text-align: left;"> Treatment 1=placebo 2=thiotepa</td> </tr> <tr> <td style="text-align: left;"> number:</td><td style="text-align: left;"> Initial number of tumours (8=8 or more)</td> </tr> <tr> <td style="text-align: left;"> size:</td><td style="text-align: left;"> size (cm) of largest initial tumour</td> </tr> <tr> <td style="text-align: left;"> start:</td><td style="text-align: left;"> start of interval (0 or previous recurrence time)</td> </tr> <tr> <td style="text-align: left;"> stop:</td><td style="text-align: left;"> recurrence or censoring time</td> </tr> <tr> <td style="text-align: left;"> enum:</td><td style="text-align: left;"> which recurrence (up to 4)</td> </tr> <tr> <td style="text-align: left;"> </td> </tr> </table> <h3>Source</h3> <p>Andrews DF, Hertzberg AM (1985), DATA: A Collection of Problems from Many Fields for the Student and Research Worker, New York: Springer-Verlag. </p> <p>LJ Wei, DY Lin, L Weissfeld (1989), Regression analysis of multivariate incomplete failure time data by modeling marginal distributions. <em>Journal of the American Statistical Association</em>, <b>84</b>. </p> <hr /><div style="text-align: center;">[Package <em>survival</em> version 2.44-1.1 <a href="00Index.html">Index</a>]</div> </body></html>